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Effect of Wide-narrow-row on Yield Formation and Nitrogen Utilization Efficiency of Luliangyou 996

ZHANG Xiao-ping1,WU Xiao-jing2,YI Zhen-xie3,,TU Nai-mei3,ZHANG Yang3(1 Chenzhou Institute of Agricultural Sciences,Chenzhou,Hunan 423042,China;2 Chenzhou Crop Seed Storage and Technology Extension Station,Chenzhou,Hunan 423000,China;3 College of Agronomy,Hunan Agricultural University,Changsha,Hunan 410128,China)  
Effects of wide-narrow-row and equal-row on yield formation characteristics and nitrogen utilization efficiency of super early rice combination Luliangyou 996 were comparatively studied under conditions of 0 and 180 kg /hm2,and the main results showed that (1) wide-narrow-row treatment could increase yield at a certain extent compared to equal-row treatment,and the reasons on yield-increasing were heightening effective painicle by promoting tillering,heightening grain number per panicle by promoting spike differentiation,promoting dry matter accumulation by increasing leaf area and delaying senescence of leaves,decreasing output percent of stem-sheath store matter and improving source-sink relationship.(2) Compared to equal-row treatment,nitrogen accumulation,nitrogen use efficiency and nitrogen uptake efficiency in wide-narrow-row treatment were increased significantly,nitrogen harvest index and nitrogen utilization efficiency were decreased significantly,while nitrogen physiological efficiency and nitrogen fertilizer efficiency changed unobviously.
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